Miniature optical fiber Fabry-Pérot ultrasonic transducer for ultrasound detection

Pengcheng Zhao; Chao Zhao; Wei Song; Chonglei Zhang

doi:10.1117/12.2688049

16 October 2023 Miniature optical fiber Fabry-Pérot ultrasonic transducer for ultrasound detection

Pengcheng Zhao, Chao Zhao, Wei Song, Chonglei Zhang

Proceedings Volume 12792, Eighteenth National Conference on Laser Technology and Optoelectronics; 1279208 (2023) https://doi.org/10.1117/12.2688049
Event: Eighteenth National Conference on Laser Technology and Optoelectronics, 2023, Shanghai, China

Abstract

Piezoelectric ultrasonic transducers are difficult to meet the requirements of high sensitivity and small size for photoacoustic endoscopy imaging. Fabry-Pérot (F-P) resonator ultrasound sensors based optical fiber are not only small in size and high in sensitivity but also easy to integrate with photoacoustic endoscopy imaging systems. However, the typical F-P resonator lacks lateral confinement of the beam and is very sensitive to misalignment, resulting in a significant reduction in the quality factor (Q-factor). We propose a waveguide plane-concave F-P resonator, where the concave structure can provide lateral confinement and solve unaligned, and the waveguide can provide lateral confinement and relax curvature matching between the concave surface and the wavefront. Suitable waveguide length and concave curvature can yield high quality factors (> 10⁴) and Noise Equivalent Power (NEP) low as 29.4 𝑚𝑃𝑎√𝐻𝑧. The structure is directly fabricated on the fiber end face by two-photon polymerization 3D printing technology, the processing accuracy can low as 200 nm. It can accurately and quickly realize complicated 3D structure. And different materials with different characteristics can meet different ultrasonic detection bandwidth and sensitivity.

Citation Download Citation

Pengcheng Zhao, Chao Zhao, Wei Song, and Chonglei Zhang "Miniature optical fiber Fabry-Pérot ultrasonic transducer for ultrasound detection", Proc. SPIE 12792, Eighteenth National Conference on Laser Technology and Optoelectronics, 1279208 (16 October 2023); https://doi.org/10.1117/12.2688049

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